FTP Downloading a file while its upload is in progress

I have a windows service (VB.NET) which downloads files from a server a开发者_JAVA技巧fter a specific interval. What happens if it try to download a file when its upload is in progress?

If it creates some problem, how to cope with this situation?

Thanks, Imran

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It depends on the implementation of the FTP server.
Most servers will probably throw an access denied exception when downloading the file, which you can catch. (Catch a WebException and look at the response and/or the status code)